20 Sets Bra Strap Adjustment Sliders Rings Clear 15 mm 20xFig 8 +20xFig 0
18-21 mm = 18 mm inside, 21 mm outside. 15-18 mm = 15 mm inside, 18 mm outside. 10-13 mm = 10 mm inside, 13 mm outside. 9-11 mm= 9 mm inside, 11 mm outside. 12-15 mm = 12 mm inside, 15 mm outside. 6-8 mm = 6 mm inside, 8 mm outside.